Influence of interaction between charged particles and dielectric surface over a homogeneous barrier discharge in nitrogen

TL;DR: In this article, the state of the art on scientific and technologic locks, which have to be opened to consider direct atmospheric pressure plasma-enhanced chemical vapor deposition (AP-PECVD) a viable option for industrial application, is established.

TL;DR: In this paper, a state-of-the-art understanding on the physics of homogeneous dielectric barrier discharge at atmospheric pressure is presented. But it is based on the analysis of present and previous work about the behavior of these discharges and the conditions to get them.

TL;DR: In this paper, a review summarizes the state of the art of plasma diagnostics on atmospheric pressure plasmas formed at characteristic length scales of approximately 1 mm or smaller and identifies challenges and prospects.

Abstract: The main focus of the review is on dynamics and kinetics of near-surface discharge plasmas, such as surface dielectric barrier discharges sustained by AC and repetitively pulsed waveforms, pulsed DC discharges, and quasi-DC discharges, generated in quiescent air and in the airflow. A number of technical issues related to plasma flow control applications are discussed in detail, including discharge development via surface ionization waves, charge transport and accumulation on dielectric surface, discharge contraction, different types of flow perturbations generated by surface discharges, and effect of high-speed flow on discharge dynamics. In the first part of the manuscript, plasma morphology and results of electrical and optical emission spectroscopy measurements are discussed. Particular attention is paid to dynamics of surface charge accumulation and dissipation, both in diffuse discharges and during development of ionization instabilities resulting in discharge contraction. Contraction leads to significant increase of both the surface area of charge accumulation and the energy coupled to the plasma. The use of alternating polarity pulse waveforms accelerates contraction of surface dielectric barrier discharges and formation of filamentary plasmas. The second part discusses the interaction of discharge plasmas with quiescent air and the external airflow. Four major types of flow perturbations have been identified: (1) low-speed near-surface jets generated by electrohydrodynamic interaction (ion wind); (2) spanwise and streamwise vortices formed by both electrohydrodynamic and thermal effects; (3) weak shock waves produced by rapid heating in pulsed discharges on sub-microsecond time scale; and (4) near-surface localized stochastic perturbations, on sub-millisecond time, detected only recently. The mechanism of plasma-flow interaction remains not fully understood, especially in filamentary surface dielectric barrier discharges. Localized quasi-DC surface discharges sustained in a high-speed flow are discussed in the third part of the review. Although dynamics of this type of the discharge is highly transient, due to its strong interaction with the flow, the resultant flow structure is stationary, including the oblique shock and the flow separation region downstream of the discharge. The oblique shock is attached to a time-averaged, wedge-shaped, near-wall plasma layer, with the shock angle controlled by the discharge power, which makes possible changing the flow structure and parameters in a controlled way. Finally, unresolved and open-ended issues are discussed in the summary.

TL;DR: In this article, the authors presented theoretical calculations of the large-signal admittance and efficiency achievable in a silicon p-n-v-ns Read IMPATT diode.

TL;DR: Theoretical predictions are given of the spatiotemporal distribution of charged-particle densities and electric field in a radio-frequency glow discharge and the numerical model predicts the formation of double layers at the plasma-sheath boundaries, in agreement with recent experimental measurements based on spectroscopic plasma-diagnostic techniques.

TL;DR: In this article, the authors present an analytical theory of Vibrational Kinetics of Anharmonic Oscillators, including the effects of V-V and V-T exchange.

TL;DR: In this article, the authors studied the kinetics of the lowest excited singlet state of molecular nitrogen, N2(a′, 1Σ−u,v=0), in a discharge flow reactor, where the metastables were generated in a hollow cathode dc discharge through molecular nitrogen highly diluted in argon, and detected by VUV flourescence of the forbidden N2 (a′) band system.